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Title: A LINK BETWEEN X-RAY EMISSION LINES AND RADIO JETS IN 4U 1630-47?

Recently, Díaz Trigo et al. reported an XMM-Newton detection of relativistically Doppler-shifted emission lines associated with steep-spectrum radio emission in the stellar-mass black hole candidate 4U 1630-47 during its 2012 outburst. They interpreted these lines as indicative of a baryonic jet launched by the accretion disk. Here we present a search for the same lines earlier in the same outburst using high-resolution X-ray spectra from the Chandra HETGS. While our observations (eight months prior to the XMM-Newton campaign) also coincide with detections of steep spectrum radio emission by the Australia Telescope Compact Array, we find no evidence for any relativistic X-ray emission lines. Indeed, despite ∼5 × brighter radio emission, our Chandra spectra allow us to place an upper limit on the flux in the blueshifted Fe XXVI line that is ≳ 20 × weaker than the line observed by Díaz Trigo et al. We explore several scenarios that could explain our differing results, including variations in the geometry of the jet or a mass-loading process or jet baryon content that evolves with the accretion state of the black hole. We also consider the possibility that the radio emission arises in an interaction between a jet and the nearby interstellar medium, inmore » which case the X-ray emission lines might be unrelated to the radio emission.« less
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ; ;  [6]
  1. Department of Astronomy, Boston University, Boston, MA 02215 (United States)
  2. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701 (South Africa)
  3. Department of Physics, Oxford University, Oxford OX1 3RH (United Kingdom)
  4. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
  5. Max Planck Institute fur Extraterrestriche Physik, D-85748 Garching (Germany)
  6. CSIRO Astronomy and Space Science, Australia Telescope National Facility, P.O. Box 76, Epping, NSW 1710 (Australia)
Publication Date:
OSTI Identifier:
22365976
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 784; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; BARYONS; BLACK HOLES; DETECTION; DOPPLER EFFECT; EMISSION SPECTRA; IRON IONS; JETS; MASS; RELATIVISTIC RANGE; RESOLUTION; STARS; STELLAR WINDS; TELESCOPES; X RADIATION; X-RAY SPECTRA